All the IPS packages have been refreshed;
those for SDK w/ JDK have the new JDK components while those for the SDK w/o JDK have changed
only very slightly.
Since I normally use a Mac, I use an SDK w/o JDK; in that case,
the only file changed is the about_sdk.html in the
sdk-branding IPS component
(or about_sdk_web.html in
sdk-branding-web for web profile).

If you have installed the Java EE 6 SDK and enabled its Desktop Notifier, the update machinery will (eventually) detect the new packages, which will activate the following sequence:

First you will see the notifier;
you can either dismiss it, or you can click on it to continue the update process

Next you will be presented an overview of the available updates. There may be more than one, depending on what you have installed in your machine.
For each one, you will be shown the size of the download (3.4KB in this case - since it is just one file in one component) and you will be asked to accept the license.

You can also manage the details for the installation process... and you are given an opportunity to look at the Ads :-)

The next step is the actual download, and a report on its completion.

At this point you can ask for details of the installed software.
For example, you can go look at what components have been installed and their properties, or what AddOns are available, or what repositories you are using.

As you can see, this is all very painless.
The upgrade is almost a no-op in this case but the same exact process will be used for larger updates
and, since
IPS
underlies all the
GlassFish 3
distributions, this also applies to the
Commercial Distributions
from Oracle.